The emergence of many diverse species from a common ancestor is called
A) adaptive radiation.
B) gradualism.
C) allopatric speciation.
D) hybridization.
Answer: A
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The supercoils in the loops of the nucleoid can be relaxed by introducing nicks
A. true B. false
Arranging homologous pairs of chromosomes in order from longest to shortest is called:
A. a karyotype. B. chromosome painting. C. chromosome numbering. D. a nuclear genome. E. Both chromosome painting and chromosome numbering are correct.
Viruses come in several shapes. All of the following are shapes of viruses EXCEPT:
A. head and tail. B. triangular. C. icosahedral. D. helical. E. spiral.
The ____ produce(s) ____, which influences biological rhythms and the onset of sleep
a. pituitary gland; thyroid stimulating hormone b. pituitary gland; adrenocorticotropic hormone c. pineal gland; melatonin d. adrenal cortex; cortisol e. parathyroid glands; parathyroid hormone